Dental motith



(Model.)

B. GAS H'. DENTAL MOUTH SPEGULUM.

No.- 443,512. Patented Dec. 30, 1890.

mwmtoz WWW UNITED STATES PATENT OFFICE.

EDGAR GASH, OF MACOMB, ILLINOIS.

DENTAL MOUTH-SPECULUM.

SPECIFICATION forming part of Letters Patent No. 4A3,512, dated December30, 1890.

Application filed April 18, 1890. Serial No. 348,588. (ModeL) To allwhom it may concern:

Be it known that I, EDGAR GASH, of Macomb, in the county of McDonoughand State of Illinois, have invented a new and useful Improvement inDental Mouth-Support and Adjustable Mirror Combined, of which thefollowing description will enable others skilled in the art to make anduse the same, reference being had to the accompanying drawings, whichmake a part of this specification.

The object of this invention is to construct a dental mouth-supporthaving combined therewith an adjustable mirror, all of which will befully described in the following de scription and pointed out in theclaims.

In the drawings, Figure 1 is a perspective view, and Fig. 2 is asectional elevation of Fig. 1. Fig. 3 is a cross-section of Fig. 1 onthe line y y. Figs. 4 and 5 are detached parts, which will be referredto hereinafter.

A in the drawings represents a strong frame made of spring-wire bentinto the shape shown in Figs. 1 and 2, forming spring-jaws s s, to whichthe guards f f are firmly at tached.

B represents a metal sheath, into which the rear part of the frame isplaced (shown in dotted lines, Fig. l) and is secured to the sheath bythe rivets e e, which pass through the sheath and the upper ends of thewire frame A, securing the sheath and frame together.

J represents a mirror, which is attached to the disk 0 ata (see Fig. 3)by means of the projecting ears 2' i, (see Figs. 3 and 5,) forming aflexible hinge, underneath which the spiral spring d is placed. One endof the spring rests against the hinge a, the other against the back ofthe sheath, and the object of this spring dis to press against the disk0 sufficiently to keep the disk up against the inside of the front partof the sheath (see Fig. 3) with sufficient force to keep the disk in anyposition that it may be placed in, the pressure of the spring againstthe hinge of the mirror producing sufficient friction to keep the mirrorin any position that it may be placed in. The mirror can be slid eitherup or down in the slot it (see Fig. 1) or turned to either side andswung out, (see Fig. 2,) as maybe required by the operator to reflectthe part to be operated upon.

0 e c 0 represent raised ribs on the back of the sheath to catch on theteeth to prevent the support from slipping when in operation. The spacean on the back of the sheath (see Fig. 4) is for a way on the inside ofthe back of the sheath for the spring d to slide on when the mirror isbeing slid either up or down in the slot at.

The operation is as follows: The mouthsnpport is used in connection withrubber dam and a rubber-dam clamp. The rubber dam and clamp are placedon the tooth to be operated upon in the usual manner. Then themouth-support is placed in the mouth with the jaws .5- s of the frame Aover the tooth to be operated upon. Then suitable forceps are placedbetween the jaws of the frame A at h and the jaws are pressed apart (thesheath B being made sufficiently wide for that purpose) sufficient toallow the jaws to pass down over the rubber-dam clamp described above.The forceps being removed, the jaws will spring together and hold to theteeth and clamp sufficient to hold the support firm in the mouth. Theinner guard f holds the tongue down and the outer guard f presses thelip out of the way. The mirror J, being attached to the sheath B in afleXi-' ble manner, can be placed in any required position that isnecessary to reflect the tooth to be operated upon. The support issufficiently strong to hold the mouth open. The guardsff by holding thetongue down and the lip out of the way allow the operator the freedom ofboth hands.

Having thus described myinvention, what I claim as new, and desire tosecure by Letters Patent, is-

1. A dental mouth-support composed of the wire frame A, havingspring-jaws s s and guards ff, and the sheath B, having ribs 0 c c 0attached, substantially as herein shown and described.

2. A dental mouth-support having a wire frame formed U shape, havingspring-jaws s s and guards ff, and the sheath B, having slot 91. andribs 0 c c c, in combination with the adjustable mirror J and yieldingspring d, substantially as herein shown and described, for the purposeset forth.

EDGAR GASII.

Witnesses:

T. J. PRICE, M. T. PRICE.

